Christmas star with 6 10mm LED's (3 in parallel with 3) can be powered with 9v battery.  Typical 9v battery will provide approximately 1 amp/hr.  LED's wired as shown should provide over 24 hours of light.  I used Transparent clear PETG 10% infill topped with gold at the color change at 28mm.  Chanzon RGB 10 mm LED's.